Cheapest Gigabyte G1 Gaming available right now. Everywhere else is £499.99.
Not as cheap as the recent Zotac GTX 1080 AMP Edition (£455.99) but that has expired now and some may prefer this one.
This is the same PROMO as the Zotac. It'll end in 24 hours at 9:00 AM on the 18th March.
Edit: Nvidia Promotion: Be The Hero - For Honor or Ghost Recon: Wildlands for free.